Ultrasound cervix in pregnancy
Modern ultrasound examination of this part of the female body rarely administered in the form of an independent procedure, therefore is usually done in one day with the examination of the uterus and its appendages. With this diagnostic method can be used to understand changes in the degree of blood supply and tissue structure of this organ, from what we can make preliminary conclusions about a possible disease.
Why an ultrasound examination is performed?
This type of research are doing any day of the menstrual cycle to identify the changed tissue of the cervix, the detection of anomalies of the structure and deformation, the diagnosis of tumors and precise evaluation of the depth of germination.
A short cervix is considered dangerous gynecological pathology, threatening the normal course of pregnancy, and its smoothing and disclosure leads to the appearance of isthmic-cervical insufficiency, in which she holds the fetus in the uterine cavity. In this case, preterm labor or miscarriage at different weeks of pregnancy.
Preparation for the procedure depends on the indication for the operation and the method of performing an ultrasound. At high pregnancy the procedure is performed every day, at the same time, a preliminary training is not required. But before examining for the presence of a disease, requires the filling of the bladder. Typically, this day requires drinking 800 to 1,000 milliliters of liquid (drinking water), usually one hour before the study.
But due to changes of the uterus during the menstrual cycle in nonpregnant women ultrasound is preferably carried out at 5-7 days from the first day of menstruation.
In modern obstetric practice, the following types of ultrasound:
- transabdominal ultrasound, which is performed through the skin of the abdomen with full bladder;
- transvaginal ultrasound, performed with a help of introduced in the vagina of the sensor that reports the exact dimensions of the opening and the image of the uterine cervix.
The change of the internal OS of the cervix and its opening, resulting in the occurrence of premature birth in the early weeks of pregnancy, is detected only in the process of transvaginal sonography and other types of ultrasound remains unidentified.
You must know that sometimes the cervix is inspected through the abdomen and transvaginally, and the day cycle has a great influence on the results. When this manipulation is carried without pain.
When viewed through the skin sensor moves in the lower abdomen after the application of the research a special gel improves the conduction of ultrasound. On transvaginal sensor for hygienic purposes previously put on a condom with a preliminary application to the surface of the gel.
In normal pregnancy study is prescribed by a doctor in the following terms:
- at 11-13 weeks
- in 20-24 weeks
- at 30-32 weeks
If you require any additional information, the number of procedures increases, and the ultrasound is appointed for a certain day of the cycle at the discretion of the observing physician.
Procedure in the first trimester is assigned at 11-13 weeks. At this period:
- excludes tubal pregnancy;
- you can see the number of fertilized eggs in the uterus and their size;
- term pregnancy is defined more precisely.
The fertilized egg is detected from the 3rd week of conception, and in 4-5 weeks it is already perfectly visible the embryo. At the same time clearly defines the fetal heart rate, motor activity which is assessed 7-8 weeks.
The next ultrasound is assigned at 20-24 weeks. In this period determined the dynamics of growth and fetal weight, dimensions and possible defects. During the procedure, the doctor performs a length measurement of the cervix determines the condition of the cervical canal, and its possible disclosure. They also evaluated the risk of premature birth and the approximate date of their onset. With high confidence at this time is determined by the sex of the baby.
Ultrasound in the third trimester is a study that shows the violation of the condition of the fetus and blood flow, and the amount of amniotic fluid. To conduct the ultrasound can be any day of the female menstrual cycle except themselves days of menstruation.
Results and norms
Normal ultrasound examination of the cervix of the pregnant uterus both her throat closed tightly, and closer to the moment of birth begins the smoothing collar. There are rules, approved by gynecologists. But sometimes appear some deviations from them, in which correction is required to prevent the development of fetal abnormalities.
Ultrasound or colposcopy of the cervix women conducted at any time of the menstrual cycle, ends with the confirmation or refutation of the alleged pathology.
In that case, if the diagnosis is unclear or requires clarification, shall be a further ultrasound or colposcopy during the day cycle, which is determined by the doctor.
Special value have the ultrasound results to women who are in the position because they need to know the size and the opening of the cervix. Normal length dimensions are different depending on the duration of pregnancy. Nonpregnant women with the regularity of the menstrual cycle neck length ranges from 32 to 50 millimeters and both indicators are thus considered to be the norm. By mid-pregnancy cervical length becomes smaller.
Women who for the first time preparing to leave, the size of the cervix more than 3 cm, and re-pregnant — more than 2.9 cm by the seventh month the figures the dimensions change again to 3.7 and 4.5 cm Width of the neck during pregnancy increases slowly and at the time of birth exceeds 3.5 cm.
Ultrasound of the cervix – an important study in modern gynecological practice, allowing to obtain data that cannot be read during normal inspection.